1.

A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it ? How many of these are tetrahedral voids?

Answer»

SOLUTION :Total number of atoms in 0.5 MOL of HCP lattice `= 0.5 xx NA`
`therefore ` Total number of TETRAHEDRAL voids are
`(2 xx 0.5 NA) = 6.022 xx 10^23`
`therefore` Total number of voids = No. of Octahedral voids + No. of Tetrahedral voids.
`= 3.011 xx 10^23 + 6.022 xx 10^23 `
` = 9.033 xx 10^23`


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